Scatter
Danger
The size is not working.
The following code:
import gr
import sequtils, sugar, math
let x = linRange(0.0, 1.0, 11)
let y = linRange(0.0, 1.0, 11)
let s = linRange(50.0, 400.0, 11)
let c = linRange(0.0, 255.0, 11)
scatter(x,y,s,c)
discard readLine(stdin)
grm_finalize()
creates the following window: